Detsky and Gropper (1) make an analogy to the athlete who loses skills after leaving the playing field. Player–coaches were once common in sports but have largely disappeared. Top athletes understand the value of a skilled observer on the sidelines who can help them improve their play. Even athletes in individual sports, who are as autonomous as any physician, place great value on their coaches and pay them out of their own pockets. The great coaches have often been undistinguished as players and are almost never superstars, but they have a skill set that differs from that of the player and is every bit as valuable.